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ee1858d3 LK |
1 | #include <linux/kernel.h> |
2 | #include <linux/module.h> | |
3 | #include <linux/init.h> | |
4 | #include <linux/proc_fs.h> | |
5 | #include <linux/string.h> | |
b80a7186 DM |
6 | #include <linux/jiffies.h> |
7 | #include <linux/timer.h> | |
8 | #include <linux/uaccess.h> | |
ee1858d3 LK |
9 | |
10 | #include <asm/auxio.h> | |
11 | ||
12 | #define LED_MAX_LENGTH 8 /* maximum chars written to proc file */ | |
13 | ||
14 | static inline void led_toggle(void) | |
15 | { | |
16 | unsigned char val = get_auxio(); | |
17 | unsigned char on, off; | |
18 | ||
19 | if (val & AUXIO_LED) { | |
20 | on = 0; | |
21 | off = AUXIO_LED; | |
22 | } else { | |
23 | on = AUXIO_LED; | |
24 | off = 0; | |
25 | } | |
26 | ||
27 | set_auxio(on, off); | |
28 | } | |
29 | ||
30 | static struct timer_list led_blink_timer; | |
31 | ||
32 | static void led_blink(unsigned long timeout) | |
33 | { | |
34 | led_toggle(); | |
35 | ||
36 | /* reschedule */ | |
37 | if (!timeout) { /* blink according to load */ | |
38 | led_blink_timer.expires = jiffies + | |
39 | ((1 + (avenrun[0] >> FSHIFT)) * HZ); | |
40 | led_blink_timer.data = 0; | |
41 | } else { /* blink at user specified interval */ | |
42 | led_blink_timer.expires = jiffies + (timeout * HZ); | |
43 | led_blink_timer.data = timeout; | |
44 | } | |
45 | add_timer(&led_blink_timer); | |
46 | } | |
47 | ||
48 | static int led_read_proc(char *buf, char **start, off_t offset, int count, | |
49 | int *eof, void *data) | |
50 | { | |
51 | int len = 0; | |
52 | ||
53 | if (get_auxio() & AUXIO_LED) | |
54 | len = sprintf(buf, "on\n"); | |
55 | else | |
56 | len = sprintf(buf, "off\n"); | |
57 | ||
58 | return len; | |
59 | } | |
60 | ||
80ce8baf | 61 | static int led_write_proc(struct file *file, const char __user *buffer, |
ee1858d3 LK |
62 | unsigned long count, void *data) |
63 | { | |
64 | char *buf = NULL; | |
65 | ||
66 | if (count > LED_MAX_LENGTH) | |
67 | count = LED_MAX_LENGTH; | |
68 | ||
69 | buf = kmalloc(sizeof(char) * (count + 1), GFP_KERNEL); | |
70 | if (!buf) | |
71 | return -ENOMEM; | |
72 | ||
73 | if (copy_from_user(buf, buffer, count)) { | |
74 | kfree(buf); | |
75 | return -EFAULT; | |
76 | } | |
77 | ||
78 | buf[count] = '\0'; | |
79 | ||
80 | /* work around \n when echo'ing into proc */ | |
81 | if (buf[count - 1] == '\n') | |
82 | buf[count - 1] = '\0'; | |
83 | ||
84 | /* before we change anything we want to stop any running timers, | |
85 | * otherwise calls such as on will have no persistent effect | |
86 | */ | |
87 | del_timer_sync(&led_blink_timer); | |
88 | ||
89 | if (!strcmp(buf, "on")) { | |
90 | auxio_set_led(AUXIO_LED_ON); | |
91 | } else if (!strcmp(buf, "toggle")) { | |
92 | led_toggle(); | |
93 | } else if ((*buf > '0') && (*buf <= '9')) { | |
94 | led_blink(simple_strtoul(buf, NULL, 10)); | |
95 | } else if (!strcmp(buf, "load")) { | |
96 | led_blink(0); | |
97 | } else { | |
98 | auxio_set_led(AUXIO_LED_OFF); | |
99 | } | |
100 | ||
101 | kfree(buf); | |
102 | ||
103 | return count; | |
104 | } | |
105 | ||
106 | static struct proc_dir_entry *led; | |
107 | ||
108 | #define LED_VERSION "0.1" | |
109 | ||
110 | static int __init led_init(void) | |
111 | { | |
112 | init_timer(&led_blink_timer); | |
113 | led_blink_timer.function = led_blink; | |
114 | ||
115 | led = create_proc_entry("led", 0, NULL); | |
116 | if (!led) | |
117 | return -ENOMEM; | |
118 | ||
119 | led->read_proc = led_read_proc; /* reader function */ | |
120 | led->write_proc = led_write_proc; /* writer function */ | |
121 | led->owner = THIS_MODULE; | |
122 | ||
123 | printk(KERN_INFO | |
124 | "led: version %s, Lars Kotthoff <metalhead@metalhead.ws>\n", | |
125 | LED_VERSION); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static void __exit led_exit(void) | |
131 | { | |
132 | remove_proc_entry("led", NULL); | |
133 | del_timer_sync(&led_blink_timer); | |
134 | } | |
135 | ||
136 | module_init(led_init); | |
137 | module_exit(led_exit); | |
138 | ||
139 | MODULE_AUTHOR("Lars Kotthoff <metalhead@metalhead.ws>"); | |
140 | MODULE_DESCRIPTION("Provides control of the front LED on SPARC systems."); | |
141 | MODULE_LICENSE("GPL"); | |
142 | MODULE_VERSION(LED_VERSION); |